Answer:
Because according to valence bond theory, a triple bond is actually composed of two different kinds of bonds, one σ and two π
Explanation:
The respective bond a energies of C-C single, double and triple bonds are; 347KJmol-1, 681 KJmol-1 and 837 KJmol-1 respectively.
It can be seen that the bond energy of a triple bond is really not thrice the bond energy of a C-C single bond. This is because, a triple bond is composed of two different kinds of bonds. A C-C sigma bond and two C-C pi bonds. The C-C sigma bonds are stronger than the C-C pi bonds because sigma bonds result from a greater degree of overlap between the atomic orbitals involved in the bond.
Hence, the C-C triple bond energy is not simply three times that of the C-C single bond energy since there are actually two different kinds of bonds present as explained above.
A triple bond is generally three times as strong as a single bond because according to valence bond theory, a triple bond is actually composed of two different kinds of bonds, one σ and two π.
This is the type of attraction which occurs between atoms, ions etc and facilitate the formation of new compounds. The respective bond energies of C-C single, double and triple bonds are given as 347KJmol-1, 681 KJmol-1 and 837 KJ mol-1 respectively.
A triple bond however consists of two different kinds of bonds. A C-C sigma bond and two C-C pi bonds in which the former is stronger which was why option C was chosen as the most appropriate choice.
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